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Ek = ¹/₂ mv²
kec. = v menjadi 2v
Ek = ¹/₂ m (2v)²
Ek = ¹/₂ m 4 v²
Ek = 4 (¹/₂ mv²)
Ek = 4 (6000)
Ek = 24000 J (tidak ada dalam pilihan jawaban)
8. A₁ = 10 m²
A₂ = 40 m²
w = 2000 N
F = ...???
F/A₁ = w/A₂
F/10 = 2000/40
F = (2000/40) × 10 N
F = 500 N (C)
15. jika menggunakan kaidah tangan kanan, A = S, B = U
dilihat dari gambar penggosokkan, D = U, C = S
Jadi, pernyataan yg benar adalah B. B = U, D = U
8. F =(A1×W):A2
=(10×2.000):40
= 20.000:40
= 500 N. (C)
15. D.